Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/80—Masked polyisocyanates
  • C08G18/8003—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen
  • C08G18/8006—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32
  • C08G18/8009—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203
  • C08G18/8012—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203 with diols
  • C08G18/8019—Masked aromatic polyisocyanates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
  • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
  • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
  • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
  • C08G18/78—Nitrogen
  • C08G18/7806—Nitrogen containing -N-C=0 groups
  • C08G18/7818—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups
  • C08G18/7837—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups containing allophanate groups

Definitions

• This invention relates to a liquid polyisocyanate composition having an improved freeze stability which contain an NCO group content of 15 to 30%, and a monomeric diphenylmethane diisocyanate content of less than 90%.
• These compositions comprise a blend of (A) an MDI adduct having an NCO group content of 15 to 30%, and (B) an allophanate-modified MDI having an NCO group content of 12 to 32.5%.
• Diisocyanates which are liquid at room temperature have numerous advantages over solid diisocyanates.
• the most commercially important diisocyanates which are solid at room temperature at 4,4′-diphenyl-methane diisocyanate and 2,4′-diphenylmethane diisocyanate.
• Numerous patents have issued relating to the liquification of diphenylmethane diisocyanates (MDI).
• U.S. Pat. No. 3,644,457 discloses organic diisocyanates and specifically, mixtures of organic diisocyanates which are liquid at room temperature. These compositions comprise the reaction product of solid 4,4′- and/or 2,4′-diphenylmethane diisocyanate with a branched aliphatic dihydroxy compound in a molar ratio of 0.1 to 0.3 mol of dihydroxy compound per mol of diisocyanate. Using the disclosed reaction conditions, allophanate formation by reaction of urethane groups with isocyanate groups does not occur in these isocyanate compositions.
• U.S. Pat. Nos. 4,115,429 and 4,118,411 disclose low temperature (i.e., as low as ⁇ 5° C.) storage stable liquid diphenylmethane diisocyanates. These are produced by reacting diphenylmethane diisocyanates having a specified 2,4′-isomer content with propylene glycol or poly-1,2-propylene ether glycol. High levels of the 2,4′-isomer result in the desirable low temperature stability, however, these products exhibit considerable lower reactivity and also property changes in the polyurethane elastomers (i.e. lower tensile strength).
• liquid isocyanates are described in U.S. Pat. Nos. 4,490,300, 4,490,301 and 4,490,302.
• U.S. Pat. No. 4,490,300 discloses reaction products of MDI with an aliphatic diol having a pendant aromatic groups, e.g., 2-methyl-2-phenyl-1,3-propanediol or phenyl-1,2-ethanediol. These liquid isocyanates are disclosed as being stable at room temperature.
• Other liquid isocyanates which are stable at room temperatures include those which comprise the reaction product of MDI with monoallylether of trimethylolpropane.
• Liquid isocyanate reaction products are also disclosed by U.S. Pat. No. 4,490,302. These comprise the reaction products of MDI with mixtures of monoalcohols, poly-1,2-propylene ether glycols and low molecular weight triols.
• U.S. Pat. No. 4,738,991 discloses organic polyisocyanates which are characterized by allophanate linkages. These polyisocyanates are prepared by reacting an organic polyisocyanate include, 2,4′ and 4,4′-diphenylmethane diisocyanate with poly- or a monohydric alcohol in the presence of an organometallic catalyst. Deactivation of the catalyst is achieved using a compound such as an inorganic acid, organic acid, organic chloroformate or an organic acid chloride.
• U.S. Pat. No. 4,866,103 discloses a polyisocyanate composition for use in producing elastomers in a RIM process.
• This composition is the product of reacting an alcohol or thiol having an average functionality of from about 1.5 to about 4 and an average equivalent weight of at least about 500 with at lest 2 equivalents per hydroxyl and/or thiol equivalent of an organic polyisocyanate including the 4.,4′- and the 2,4′-isomers of diphenylmethane diisocyanate.
• These products are formed under conditions such that at least about 20% of the initially formed urethane or thiourethane groups are converted to allophanate and/or thioallophanate groups.
• U.S. Pat. No. 4,160,080 discloses a process for producing allophanate containing aliphatically and/or cycloaliphatically bound isocyanate groups in which compounds containing urethane groups are reacted with polyisocyanates having aliphatic and/or cycloaliphatic isocyanate groups, in the presence of a strong acid.
• the process is generally conducted at a temperature of from 90° C. to 140° C. for about 4 to 20 hours.
• a method of preparing liquid diphenylmethane diisocyanate disclosed by Japanese Patent Application No.1971-99176, discloses reacting diphenylmethane diisocyanate with aliphatic monovalent alcohol.
• Novel, liquid diphenylmethane diisocyanates which contain allophanate linkages are also disclosed by U.S. Pat. Nos. 5,319,053 and 5,319,054.
• the liquid stable products of U.S. Pat. No. 5,319,053 are characterized by an NCO group content of 12 to 32.5%, and comprise the reaction product of an aliphatic alcohol and a specified mixture of isomers of diphenylmethane diisocyanate.
• This reference also discloses stable liquid MDI prepolymers which comprise the reaction product of the allophanate-modified MDI as described above, with an organic material containing two or more active hydrogen groups.
• 5,319,054 describes liquid allophanate modified MDI compositions which are storage stable at 25° C.
• the diphenylmethane diisocyanate has a specific isomer distribution requiring 2-60% by weight of the 2,4′-diphenylmethane diisocyanate.
• the disclosed allophanate containing MDI prepolymers although storage stable at 25° C., are substantially lower in reactivity with polyols when compared to stable liquid MDI's according to the present invention. Allophanate modified MDI's will also result in products with lower tensile strength at higher 2,4′diphenylmethane diisocyanate contents.
• Allophanate modified diphenylmethane diisocyanate prepolymers are described in U.S. Pat. No. 5,440,003. These products are stable liquids at 25° C., and comprise the reaction product of an isomeric mixture of diphenylmethane diisocyanate and an aromatic alcohol such as phenol, with the resultant product being converted to the allophanate having an NCO group content of 12 to 32% by weight.
• U.S. Pat. No. 5,663,272 discloses allophanate modified MDI which is a storage stable liquid at 25° C. These compositions are prepared by reacting a monoisocyanate and an organic material having at least two hydroxyl groups and a molecular weight of 60 to 6,000 to form a urethane. The urethane is then reacted with an isomeric mixture of MDI to form an isocyanate product having an NCO group content of from 12 to 30%.
• This allophanate-modified MDI can be further reacted with an organic isocyanate-reactive material to form an allophanate-modified MDI prepolymer containing urethane, urea and/or biuret groups having an NCO group content of 5 to 29%.
• an organic isocyanate-reactive material to form an allophanate-modified MDI prepolymer containing urethane, urea and/or biuret groups having an NCO group content of 5 to 29%.
• Polyisocyanate mixtures which are liquid at temperatures greater than 5° C. are disclosed by U.S. Pat. No. 5,610,260. These polyisocyanates have an NCO content of 14.5 to 24% by weight and an allophanate group content of 7.7 to 14.5% by weight.
• the polyisocyanates described comprise reaction products of 4,4′-diphenylmethane diisocyanate with one or more monohydric alcohols having 4 to 16 carbon atoms at an NCO:OH equivalent ratio of 5:1 to 8.5:1, and a temperature of up to 160° C. to form urethane groups, and during or subsequent to urethane formation, converting the urethane groups in the presence of a catalyst to allophanate groups. Allophanate modified liquid MDI products made by this process provide improved low temperature stability but are slower in reactivity when compared with products of the present invention and result generally in polyurethane elastomers with lower hardness.
• Advantages of the present invention include low temperature stability combined with desirable reactivity and provision of excellent physical properties (i.e., combination of hardness, elongation and tensile strength) in resulting polyurethane elastomers.
• This invention relates to stable liquid polyisocyanate compositions characterized by improved freeze stability.
• These stable liquid polyisocyanate compositions have an NCO group content of from 15 to 30% (preferably of from 20 to 26%), contain less than 90% by weight of diphenylmethane diisocyanate, preferably less than 70% by weight, and comprise a blend of:
• Suitable MDI adducts having an NCO group content of 15 to 30% to be used as component (A) of the present invention are those comprising the reaction product of:
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer, with
• a low molecular weight branched aliphatic dihydroxy compound preferably tripropylene glycol
• Suitable allophanate-modified MDI's to be used as component (B) in the present invention are those comprising the reaction product of:
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer, and
• the present invention also relates to a process for the preparation of a stable liquid polyisocyanate composition. This process comprises:
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer, and the balance being the 4,4′-isomer, and
• a low molecular weight branched aliphatic dihydroxy compound preferably tripropylene glycol
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer, and
• the term stable means that the polyisocyanate composition has no more than a 1% absolute change in the NCO content and no more than a 10% change in the viscosity when stored at 25° C. for 3 months
• the term liquid means that the polyisocyanate composition does not precipitate solids when stored at 25° C. for 3 months.
• suitable compositions to be used as component (A) include MDI adducts having an NCO group content of from 15 to 30%, and preferably of from 20 to 26%.
• Suitable (A) MDI adducts for the present invention include those comprising the reaction product of:
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer;
• the diphenylmethane diisocyanate suitable for component (A)(1) has the isomer distribution as set forth above, wherein the sum of the %'s by weight of 2,2′-isomer, 2,4′-isomer and 4,4′-isomer must total 100% by weight of the diphenylmethane diisocyanate (A)(1). It is preferred that the diphenylmethane diisocyanate contains from about 0 to 10% by weight of the 2,4′-isomer, from about 0 to about 1% by weight of the 2,2′-isomer, and the balance being the 4,4′-isomer. Most preferably, the MDI contains from about 0 to 3% by weight of the 2,4′-isomer, from about 0 to 0.2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer.
• Suitable low molecular weight organic compounds to be used as component (A)(2) herein include, for example, branched aliphatic dihydroxy compounds such as, but not limited to compounds which contain at least two alkyl groups in the molecule such as 2-ethyl hexanediol-(1,3), 2-methyl-pentanediol-(2,4), 2,2,4-trimethylpentanediol-(1,3), 3-methyl-5-ethyl-heptanediol-(2,4), 2-methyl-2-propanediol-(1,3) or mixtures thereof.
• branched aliphatic dihydroxy compounds such as, but not limited to compounds which contain at least two alkyl groups in the molecule such as 2-ethyl hexanediol-(1,3), 2-methyl-pentanediol-(2,4), 2,2,4-trimethylpentanediol-(1,3), 3-methyl-5-ethyl-hept
• poly-1,2-propylene ether glycols of molecular weight 134 to 700, such as dipropylene glycol, tripropylene glycol or polypropylene glycol or mixtures thereof. Tripropylene glycol is particularly preferred.
• the MDI adducts i.e., component (A) of the present invention, can be prepared by the process as disclosed in, for example, U.S. Pat. No. 3,644,457, the disclosure of which is herein incorporated by reference.
• Suitable components to be used as component (B), the allophanate-modified MDI have an NCO group content of 12 to 32.5%, preferably of 20 to 26%.
• Suitable allophanate-modified MDI components to be used as component (B) of the present invention include those comprising the reaction product of:
• diphenylmethane diisocyanate containing from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer, and the balance being the 4,4′-isomer;
• Diphenylmethane diisocyanates suitable component (B)(1) of the allophanate-modified MDI include those having an isomer distribution of from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 2% by weight of the 2,2′-isomer, and the balance being the 4,4′-isomer, wherein the sum of the %'s by weight of the 2,2′-, 2,4′- and 4,4′-isomers totals 100% by weight of the diphenylmethane diisocyanate (B)(1).
• the diphenylmethane diisocyanate contains from about 0 to about 20% by weight of the 2,4′-isomer, from about 0 to about 1% of the 2,2′-isomer, and the balance being the 4,4′-isomer.
• the MDI contains from about 0 to about 3% by weight of the 2,4′-isomer, from about 0 to about 0.2% by weight of the 2,2′-isomer and the balance being the 4,4′-isomer.
• the useful aliphatic alcohols can contain about 1 to 36 and preferably 4 to 16 carbon atoms.
• Illustrative but non-limiting examples of the aliphatic alcohols can be selected from the group consisting of cycloaliphatic alcohols, aliphatic alcohols containing aromatic groups, aliphatic alcohols containing groups that do not react with isocyanates e.g., ether groups and halogens such as bromine and chlorine.
• Specific but non-limiting examples of the aliphatic alcohols can be selected from the group consisting of 2-methyl-1-propanol, cetylalcohol, cyclohexanol, 2-methoxy-ethanol, and 2-bromoethanol.
• Aliphatic alcohols for the present invention which are more preferred include the branched aliphatic alcohols such as, for example, isobutanol. Those branched aliphatic alcohols having relatively low molecular weights such as, for example, about 150 or less, are most preferred. Examples of these include isobutanol.
• the allophanate modified MDI i.e., component (B) of this invention, can be prepared by, for example, the process disclosed in U.S. Pat. Nos. 5,319,053 and 5,610,260, the disclosures of which are herein incorporated by reference.
• the liquid MDI adducts with improved freeze stable according to the invention can be prepared by blending the allophanate group containing MDI with the MDI adduct prepared by reaction of MDI with a branched aliphatic dihydroxy compound at room temperature or elevated temperatures.
• the two components can also first be blended at room temperature and then heated under agitation to i.e. 80° C. to obtain the optimal homogenity.
• the resulting blends can then be stored at 25° C.
• the term improved freeze stability means that the polyisocyanate composition is a stable liquid at less than 20° C., and preferably at less than 15° C. for 30 days or more.
• compositions comprise the reaction product of (A) an allophanate-modified MDI having an NCO group content of 16 to 32.5%, (B) a low molecular weight branched aliphatic dihydroxy compound, and (C) an epoxide functional compound in an amount of from 0.01 to 1 % by weight, based on the combined weight of (A) and (B).
• Isocyanate A diphenylmethane diisocyanate having an isomer distribution comprising of about 98% by weight of the 4,4′-isomer, and less than 2% by weight of the 2,4′-isomer. This diisocyanate has an NCO content of about 33.6% and a functionality of 2.0.
• Isocyanate B an isocyanate prepolymer having an NCO group content of about 23%, a viscosity between 550 and about 800 mPa.s at 25° C. and comprising the reaction product of about 86.2% by weight of isocyanate A and about 13.8% by weight of tripropylene glycol. This prepolymer is stable for at least 30 days at temperatures of 20° C. or greater, but freezes below 15° C.
• Isocyanate C 100 parts (pbw) of isocyanate A and 7.76 parts of 2-methyl-1-propanol were charged to a stirred reactor and heated to 60° C. 0.01 part of zinc acetylacetonate was added and the stirred reaction mixture was heated to 90° C. After one hour at 90° C. the NCO content was 23%. The reaction mixture was cooled to 60° C. and 0.025 part of benzoyl chloride was added. The reaction mixture was then cooled to 25° C. This prepolymer has a viscosity between 400 and 650 mPa.s and is stable for at least 30 days at temperatures of 5° C. or greater.
• Polyol 1 a propylene glycol started propylene oxide polyether polyol, having an OH number of about 112, a functionality of about 2 and a molecular weight of about 1000.
• Polyol 2 a propylene glycol started propylene oxide/ethylene oxide (80:20 wt.ratio) polyether polyol, having an OH number of about 28, a functionality of about 2 and a molecular weight of about 4000.
• Polyol 3 1,4-butanediol.
• Baylith L Paste a mixture of synthetic alumino-silicate in castor oil.
• Dow Corning Antifoam 1400 100% silica-filled polydimethyl siloxane, an FDA approved antifoaming agent used to prevent foam in food and chemical processes.
• Catalyst A a dibutyltin dilaurate catalyst, commercially available as Dabco T-12 from Air Products and Chemical Inc.
• Polyol Blend A comprised:
• Polyol Blend A was characterized by an equivalent weight of 281.
• the polyol blend and the isocyanate were hand mixed at 25-30° C. for 1.5-2.0 minutes, and then cast into a 105-110° C. book-case mold which measured 8 in. ⁇ 16 in. ⁇ 0.125 in. and into button molds (also pre-heated to 105-110° C.).
• the cast samples were allowed to cure at 105-110° C. in the molds for 16 hours, before being demolded. After 1 week at room temperature in a temperature and humidity-controlled environment, the samples were tested for various physical and mechanical properties. The results are set forth in Table 1 below.
• Example 1 is comparative Example 1
• Example 2 Example 3
• Example 4 Polyol Blend A 250 250 250 250 250 (grams) Isocyanate B 170.7 136.56 85.35 34.14 (grams) Isocycanate C 34.14 85.35 136.56 (grams) Freezing Point 15 12 9 5 Isocyanate Blend (° C.) NCO:OH Ratio 1.05 1.05 1.05 1.05 Tensile Strength 2124 1877 2039 2082 (psi) 100% Modulus 829 842 790 683 (psi) Elongation (%) 331 306 351 380 Die C Tear (pli) 258 240 247 221 Split Tear (pli) 84 100 102 97 Hardness Shore A 84/83 85/84 82/81 83/82 (1 sec/5 sec) Compression Set 33.3 37.6 53.5 57.1 Taber Abrasion 108 98 98 94 (wt. loss in mg/1000 cycles)
• the freeze stability of the isocyanate blends in Examples 2-4 improves with increasing amounts of Isocyanate C.
• Pure Isocyanate B, as used in Example 1 has a freezing point of 15° C.
• the isocyanate blend used in Example 4 is freeze stable to 5° C.
• Physical properties of resulting cast elastomers prepared from Isocyanate B, and blends of Isocyanate B and Isocyanate C are similar.

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• Polyurethanes Or Polyureas (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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• 2000
  • 2000-02-07 US US09/499,603 patent/US6242556B1/en not_active Expired - Lifetime
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